Low-Temperature Oligosaccharide Analysis with HPAE-PAD-MS
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Solution Overview
Problem
High alkaline conditions and temperatures in HPAE chromatography cause epimerization and degradation of human milk oligosaccharides, leading to inaccurate quantification and identification of unknown structures without analytical standards.
Innovation Solution
An analytical system and method that maintains the chromatography column, electrochemical detector, and ion removal device at a temperature of 15° C. or less, using a mobile phase with alkali acetate and hydroxide, and employs mass spectrometry for reliable identification without analytical standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high alkaline conditions and elevated temperature are used in HPAE chromatography, then oligosaccharides can be effectively eluted from the stationary phase, but epimerization and degradation of the oligosaccharides occur
Solution Approach 1:
The patent changes the temperature parameter from conventional elevated temperatures (30°C) to low temperature (15°C or less) to suppress epimerization and degradation while maintaining effective elution through optimized mobile phase composition (alkali acetate and hydroxide). This parameter change resolves the contradiction by finding a new operating condition that achieves both goals.
2Measurement precision
If conventional HPAE-PAD method with analytical standards is used, then quantification can be achieved, but identification of unknown structures becomes challenging
Solution Approach 1:
The patent implements a dual-detection system (PAD and MS) where PAD provides precise quantification and MS provides structural identification capabilities. This multi-functional approach allows the system to perform both accurate quantification of known analytes and identification of unknown structures, resolving the contradiction between precision and versatility.
3Productivity
If on-column epimerization occurs during HPAE analysis, then target analytes are lost and epimerization products are formed, but this severely affects the accuracy and robustness of quantitative method
Solution Approach 1:
The patent applies preliminary anti-action by using low temperature (15°C or less) and optimized mobile phase conditions before the chromatographic separation to prevent epimerization from occurring in the first place. This preventive measure protects the analytes during the entire analysis process, maintaining both throughput and accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces epimerization and degradation, enabling accurate quantification and identification of human milk oligosaccharides, particularly unknown structures, with improved robustness and precision.
Implementation Method 1
a chromatography column configured to separate a sample into one or more analytes
Implementation Method 2
An electrochemical detector, the electrochemical detector fluidly coupled to an output of the chromatography column
Implementation Method 3
An ion removal device configured to remove at least ions of one charge from the mobile phase
Implementation Method 4
a cooling means for keeping the chromatography column, electrochemical detector, and the ion removal device at a temperature of 15° C. or less
Data Source
AI summary
A novel analytical system and method to analyze complex carbohydrates such as human milk oligosaccharides by low-temperature High-Performance Anion Exchange Chromatography with Pulsed Amperometric Detection and High-resolution Mass Spectrometry (HPAE-PAD-MS). The analytical system controls the temperature of the column, electrochemical detector, and ion removal device at or below 15° C. The HPAE-PAD workflow with high-resolution mass spectrometry provides useful molecular structure information. It facilitates the detection of milk oligosaccharides, particularly unknown structures, without the use of analytical standards.